Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 94,254 bytes
File Type: PE
Memory Resident: No
Initial Samples Received Date: 05 Nov 2010

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RasMan\Parameters
NbfOutLowWatermark = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RasMan\Parameters
NbfOutHighWatermark = 5

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RasMan\Parameters
NbfInLowWatermark = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\RasMan\Parameters
NbfInHighWatermark = 5

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}.118.56/Dialer_Min/telcom.asp

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 07.596.03
VSAPI OPR PATTERN Date: 05 Nov 2010

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters
    • NbfOutLowWatermark = 1
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters
    • NbfOutHighWatermark = 5
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters
    • NbfInLowWatermark = 1
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters
    • NbfInHighWatermark = 5

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_IRCBRUTE.CJ. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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